Technical data

Field Replaceable Unit Removal and Replacement

Safety and Environmental Considerations

Chapter 1

Safety and Environmental Considerations

Safety and environmental considerations include electrical safety, communications interference, and

electrostatic discharge hazards to equipment.

Electrical Safety

Electrical safety precautions must be followed at all times when working on the 14-Slot Shelf.

WARNING High Voltage. There are no system power controls on the 14-Slot Shelf. System power (-48 VDC

from multiple power domains) is applied by an external power source at all times unless

disabled/disconnected at the source.

Communications Interference

Hewlett-Packard system compliance tests are conducted with Hewlett-Packard supported peripheral devices

and shielded cables, such as those received with the system. The system meets interference requirements of

all the countries in which it is sold. These requirements provide reasonable protection against interference

with radio and television communications.

Installing and using the system in strict accordance with Hewlett-Packard instructions minimizes the

chances that the system will cause radio or television interference. However, Hewlett-Packard does not

guarantee that the system will not interfere with radio and television reception.

Take these precautions:

• Use only shielded cables.

• Ensure that all cable connector screws are firmly tightened.

• Use only Hewlett-Packard supported peripheral devices.

• Ensure that all panels and cover plates are in place and secure before system operation.

Electrostatic Discharge Hazard to Equipment

Hewlett-Packard systems and peripherals contain assemblies and components that are sensitive to

electrostatic discharge (ESD). Carefully observe the precautions and recommended procedures in this manual

to prevent component damage from static electricity.

CAUTION Wear an ESD wrist strap that is connected to the same ground potential as the unit you are

working on. Connect the wrist strap to any grounded metal assembly in the 14-Slot Shelf or to

one of the ESD grounding sockets (see Figure 1-1). Both you and the electronic devices must be

grounded to avoid static discharges that can cause damage. If the 14-Slot Shelf is not connected

to earth ground, place the Shelf in an ESD-safe working environment before removing or

replacing any FRU.